5-3
LC8.5P(LED)EA
The White Balance Adjustment should be
performed when replacing the LCD Panel
or Digital Main CBA.
3. White Balance Adjustment
Purpose:
To mix red and blue beams correctly for
pure white.
Symptom of Misadjustment:
White becomes bluish
or reddish.
1. Operate the unit for more than 20 minutes.
2. Input the White Raster(70%=70IRE, 40%=40IRE).
3. Set the color analyzer at the CHROMA mode and
zero point calibration. Bring the optical receptor
pointing at the center of the LCD-Panel at a
distance of 3cm away from the LCD-Panel surface.
Note:
The optical receptor must be set
perpendicularly to the LCD Panel surface.
4. Enter the Service mode. Press [
-] button on the
remote control unit and select “C/D” mode.
5.
[CUTOFF]
Press [1] button to select “COR” for Red Cutoff
adjustment. Press [3] button to select “COB” for
Blue Cutoff adjustment.
[DRIVE]
Press [4] button to select “DR” for Red Drive
adjustment. Press [6] button to select “DB” for Blue
Drive adjustment.
6. In each color mode, press [P
/
] buttons to
adjust the values of color.
7. Adjust Cutoff and Drive so that the color
temperature becomes 12000°K (x= 0.272 / y=
0.278 ±0.005).
8. To cancel or to exit from the White Balance
Adjustment, press [BACK] button.
Test Point Adj. Point
Mode
Input
Screen
[P
/
]
buttons
[VIDEO1]
C/D
White Raster
(APL 70%)
or
(APL 40%)
M. EQ.
Spec.
Pattern Generator,
Color analyzer
x= 0.272 ± 0.005
y= 0.278 ± 0.005
Figure
Color Analyzer
L = 3 cm
Perpendicularity
INPUT: WHITE 70%, 40%
To avoid interference from ambient
light, this adjustment should be
performed in a dark room.
40%=40IRE
70%=70IRE
100IRE
100IRE
0IRE
0IRE
INPUT SIGNAL
Low
Light
Hight
Light
